pg_affected_rows

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_affected_rows — Devuelve el número de registros afectados (filas)

Descripción

pg_affected_rows(resource $result): int

pg_affected_rows() Devuelve el número de filas (casos/registros/filas) afectadas por consultas de tipo INSERT, UPDATE, y DELETE.

Desde PostgreSQL 9.0 y superior, el servidor devuelve el número de filas seleccionadas. Las versiones más antiguas de PostgreSQL devuelven 0 para SELECT.

Nota:
Esta función se llamaba pg_cmdtuples().

Parámetros

result: El recurso de resultados de la consulta PostgreSQL o PostgreSQL query result resource, es devuelto por pg_query(), pg_query_params() o pg_execute() (entre otros).

Valores devueltos

El número de filas afectadas por la consulta. Si no hay filas afectadas devolverá 0 (cero).

Ejemplos

Ejemplo #1 Ejemplo de pg_affected_rows()

<?php
$result = pg_query($conn, "INSERT INTO authors VALUES ('Orwell', 2002, 'Animal Farm')");

$cmdtuples = pg_affected_rows($result);

echo "filas que han sido afectadas: " . $cmdtuples ;
?>

El resultado del ejemplo sería:

filas que han sido afectadas: 1.

Ver también

pg_query() - Ejecutar una consulta
pg_query_params() - Submits a command to the server and waits for the result, with the ability to pass parameters separately from the SQL command text
pg_execute() - Envía una solicitud para ejecutar una setencia preparada con parámetros dados, y espera el resultado
pg_num_rows() - Returns the number of rows in a result

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User Contributed Notes 5 notes

down

Anonymous ¶

16 years ago

pg-affected-rows () only runs on the LAST SQL STATEMENT executed.  If you compound several statements together then pg_affected_rows might not return what you expect.  

For example:

<?php

$result = pg_query ('BEGIN; INSERT INTO foo (bar) VALUES (\'baz\'; COMMIT');

echo (pg_affected_rows ($result));

?>

will cause 0 to be printed, because the last statement executed by Postgres was COMMIT, which doesn't affect any rows.  

I haven't tried this so am not certain it works, but you SHOULD be able to get the row counts you want if you split your queries up.  

For example: 

<?php

$result = pg_query ('BEGIN; INSERT INTO foo (bar) VALUES (\'baz\';');

echo (pg_affected_rows ($result));

pg_query ('COMMIT;');
?>

should allow you to get the number of rows affected by the previous query.  I haven't tried this yet though, so don't count on it.

down

Bruno Baguette ¶

18 years ago

Note that when you submit several SQL queries, within one BEGIN;COMMIT; like this one :

$SQLQuery = 'BEGIN;';
$SQLQuery.= 'INSERT INTO a (a,b) VALUES (1,2);';
$SQLQuery.= 'INSERT INTO b (ref_b,c) VALUES (2,5);';
$SQLQuery.= 'COMMIT;';

$HandleResults = pg_query($SQLQuery);
echo(pg_affected_rows($HandleResults));

pg_affected_rows() will return 0

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-1

Anonymous ¶

15 years ago

There is something called auto-commit, when you supply more than one query delimited by ; semicolon all-or-none is done if one fails. No need for BEGIN;COMMIT;ROLLBACK when doing one query. its logic to mee pg_affected_rows() returns affected rows and if you want to do 2 queries apart from each other.. do a BEGIN and then 1 and get pg_affected_rows() then do 2 and get pg_affected_rows() and then finally do COMMIT;

down

-1

Anonymous ¶

18 years ago

That's not quite true, I've been able to execute multiple queries in a single call just fine. In stead, it has to do with the fact this function returns the affected rows for the last executed query, not the last set of queries specified to a single call to pg_query.

down

-5

Anonymous ¶

18 years ago

Concering Bruno Baguette's note:

The pg_query function only allows one query per function call.  When you do your
$sql="BEGIN;
INSERT ...
COMMIT;";
$result=pg_query($conn,$sql);
echo pg_affected_rows($result);

you get a zero, because only the BEGIN; is executed.

The single query per call is, I beleive, a PHP builtin protection against SQL injection attacks.  (Ie someone submitting a string paramter that ends the current query and appends another one)

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